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The curved bolt is at a certain measurement to the center polar shaft, when the gears are engaged one gear turns at 1 (one) revolution per minute around the curved bolt which is 5/16" inch in diameter and has a pitch of 24 to the inch.
There is a formula for all of this, which i will try and dig up, it has been quite some time since i made this.
This formula was in a Telescope Magazine from the States many years ago i will try and find that also
Leon
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